正则表达式之图文混排

目的 : 实现一句话中既有文字又有图片的功能.

图文混排又称富文本.

直接代码演示:

  NSAttributedString+Emoji.h 中 : 

1 #import <Foundation/Foundation.h>
2
3 @interface NSAttributedString (Emoji)
4
5 + (NSAttributedString *)emojiStringWithString:(NSMutableAttributedString *)emojiString;
6
7 @end

  NSAttributedString+Emoji.m 中:

 1 #import "NSAttributedString+Emoji.h"
 2 #import <UIKit/UIKit.h>
 3
 4 @interface EmojiAttachment : NSTextAttachment
 5
 6 @end
 7
 8 @implementation EmojiAttachment
 9
10 - (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)lineFrag glyphPosition:(CGPoint)position characterIndex:(NSUInteger)charIndex
11 {
12     return CGRectMake( 0 , -3, lineFrag.size.height, lineFrag.size.height);
13 }
14
15 @end
16
17
18 @implementation NSAttributedString (Emoji)
19
20 + (NSAttributedString *)emojiStringWithString:(NSMutableAttributedString *)emojiString
21 {
22     NSRegularExpression *regularEx = [NSRegularExpression regularExpressionWithPattern:@"m[0-9]{3}" options:NSRegularExpressionCaseInsensitive error:nil];
23
24     NSString *string = emojiString.string;
25
26     NSTextCheckingResult *result = [regularEx firstMatchInString:string options:NSMatchingReportCompletion range:NSMakeRange(0, string.length)];
27     if (result != nil) {
28         NSString *imageName = [NSString stringWithFormat:@"%@.png", [string substringWithRange:result.range]];
29         EmojiAttachment *attachment = [[EmojiAttachment alloc] initWithData:nil ofType:nil];
30         attachment.image = [UIImage imageNamed:imageName];
31         NSAttributedString *attrString = [NSAttributedString attributedStringWithAttachment:attachment];
32
33         [emojiString replaceCharactersInRange:result.range withAttributedString:attrString];
34         // 递归
35         [self emojiStringWithString:emojiString];
36     } else {
37         return emojiString;
38     }
39     return emojiString;
40 }

    在控制器中:

1      NSString *string = @"菲尼模式的博客,m006m008 图文混排又称富文本m010 !!! 菲尼模式的博客,m006m008 图文混排又称富文本m010!!!菲尼模式的博客,m006m008 图文混排又称富文本m010!!!";
2     self.myLabel.attributedText = [NSAttributedString emojiStringWithString:[[NSMutableAttributedString alloc]initWithString:string]];
3     self.myLabel.font = [UIFont boldSystemFontOfSize:23];

   直接把.m 和.h文件放入工程中即可使用.  

实现效果 :